Not really I want only one bibtex entry for one site with serveral of urls. Or would you add serveral bibtex entries for one book if you referance serveral pages?
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rekireJan 23 '12 at 10:50

You can use the [link text](http://someurl.com) syntax to add links. Simply press the 'Help' link below 'Add Comment' to see this and the other formatting options.
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Martin Scharrer♦Jan 23 '12 at 11:17

Why not trying to use your second idea (the URL as "page" reference), but put the whole citation in a footnote (using \footnote{\cite[]{}} or a custom \footcite[]{}.
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ienisseiJan 23 '12 at 11:18

A custom cite would be an option but I wanted to see what the professionals would do. \newcommand{\citeUrl}[4]{\nocite{#1}\hyperlink{cite.0@#1}{[#2\footnote{\url{#4}‌​}, #3]}} should work \citeUrl{Google2012}{Lifecycle}{Goo12}{http://...}
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rekireJan 23 '12 at 11:26

If I don't mask the # I'll get an error. Your solution works good. But I have a little problem with adding such footnote cites in image descriptions. The cited image is quiet big so it is floated to the end of the chapter. That is at the moment no problem. But the footnote is refering the first page instat the footnote with the link.
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rekireJan 23 '12 at 12:37

@rekire Footnotes to captions are bad practice, particularly for page floats. Put the URL in the caption, where it belongs.
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egregJan 23 '12 at 13:04

I think so too but I don't know how to do that better. How should I quote an Image with that page vs. site situation.
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rekireJan 23 '12 at 13:40

@rekire For the error with the unescaped # a minimal example is needed. Also an example for the problematic caption would be great.
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egregJan 23 '12 at 13:43